# Presentation of Refrigeration Simulation

BUET Drama Society
25 de Jan de 2015

### Presentation of Refrigeration Simulation

1. A Presentation on STUDY OF A REFRIGERATION UNIT Prepared By Muhammad Shafiul Munir Student ID: 0902049 A2 (Group 04) Partner’s: 0902046 0902047 0902048 0902050 Department of Chemical Engineering, BUET Date: 05.06.2013
2. Presentation at a Glance  What is Refrigeration  Vapour- Compression Refrigeration Cycle  Why we are so concerned about Refrigeration  Experimental Set-up  Schematic Diagram  Graphs  Result  Thermodynamic Significance of Refrigeration  Conclusion
3. What is Refrigeration ?? Transfer of heat from a Lower Temparature region from a higher one The device that works cyclically to perform this job is Refrigerator The working fluid used in refrigerator is called refrigerant.
4. Ideal Vapour Compression Cycle 1. (1-2) Isentropic Compression in a Compressor 2. (2-3) Constant Pressure Heat Rejection in a Condenser 3. (3-4) Throttling in an expansion device 4. (4-1) Constant Pressure Heat Absorption in an Evaporator
5. The Actual Vapour Comoression Cycle Irreversibility • Fluid Friction (Pressure Drop) • Heat Transfer
6. Why Study Refrigeration ??  Food Preservation  Gas Liquefaction  Used in Oil Refineries  Chemical Plants  Petro-Chemical Plants
7. Why Study Refrigeration (Continued) ??  Steel and Cutlury  Meats, Fish and Poultry  Dairy Industry  Transporting Temperature Sensetive foodstuffs or pharmaceuticals.
8. Experimental System
9. Schematic Diagram
10. Calculation Process 1. Rate of Heat Transfer in both Evaporator and Condenser- Q= ṁCp(Δt) 2. Overall Heat Transfer Co-efficient for both Evaporator and Condenser- U= Q/ AΔt LMTD 3. Compressor Pressure Ratio- P= Pc/Pe
11. Results Observation Number Rate of Heat Transfer to Water in Evaporator, Qe (W) Rate of Heat Transfer to Water in Condenser, Qc (W) Overall Heat Transfer Coefficient, Ue(W/m2.0C) Over all Heat Transfer Coefficient, Uc(W/m2.0C) Compressor Pressure Ratio, ( Pc / Pe) 01 20.5 41.8 52.25 375.8 10.77 02 167.2 41.8 435.78 529.7 10.49 03 12.54 83.6 31.75 1435.4 10.45 04 83.6 125.4 227.37 1810.9 11.41 05 41.8 125.4 104.5 1810.9 11.55
12. Graph 01: Saturation Pressure Vs. Saturation Temperature 0 50 100 150 200 250 300 0 20 40 SaturationPressure Saturation Temperature Evaporator Condenser Actual Experimental
13. Graph 02: Heat Transfer Rate Vs. Condensing Temperature 0 20 40 60 80 100 120 140 160 180 20 25 30 HeatTransferRate Condensing Temperature Heat Transfer Rate Vs. Condensing Temperature Heat Transfer Rate Evaporator Heat Transfer Rate Condenser Actual Experimental
14. Graph 03: Heat Transfer Rate Vs. Compressor Pressure Ratio 0 20 40 60 80 100 120 140 160 180 10 11 12 HeatTransferRate Compressor Pressure Ratio Heat Transfer Rate Vs. Compressor Pressure Ratio Heat Transfer Rate Evaporator Heat Transfer Rate Condenser ExperimentalActual
15. Refrigeration- Thermodynamic Point of View  Refrigeration operates on a true Thermodynamic cycle  It Involves- Nucleate Boiling and Filmwise Condensation Steady Flow processes like throttling, compression and Heat Exchange. Flow Control
16. Conclusion  In this experiment our main objective was to study refrigeration unit.  After the Experiment it is quite clear that the objectives were quite fulfilled.  Performance of refrigeration can be increased using- Cascade Refrigeration System Multistage Refrigeration System
17. Questions ???